From d00330fdf0cd12e71aaff53783c6f1b302840dc3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Diego=20Elio=20Petten=C3=B2?= <flameeyes@flameeyes.eu>
Date: Sat, 7 Dec 2013 23:25:12 +0000
Subject: otultra2: implement a zero log command to clear a device's memory.

---
 glucometer.py                       |  9 +++++++++
 glucometerutils/drivers/otultra2.py | 12 +++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/glucometer.py b/glucometer.py
index 1cd0303..baa21ca 100755
--- a/glucometer.py
+++ b/glucometer.py
@@ -39,6 +39,9 @@ def main():
     '--set', action='store', nargs='?', const='now', default=None,
     help='Set the date rather than just reading it from the device.')
 
+  reset = subparsers.add_parser(
+    'zero', help='Zero out the data log of the meter.')
+
   args = parser.parse_args()
 
   driver = importlib.import_module('glucometerutils.drivers.' + args.driver)
@@ -58,6 +61,12 @@ def main():
         print('%s: not a valid date' % args.set, file=sys.stderr)
     else:
       print(device.get_datetime())
+  elif args.action == 'zero':
+    try:
+      device.zero_log()
+      print('Device data log zeroed.')
+    except Exception as e:
+      print('Error while zeroing device log: %s' % e)
   else:
     return 1
 
diff --git a/glucometerutils/drivers/otultra2.py b/glucometerutils/drivers/otultra2.py
index 1a29d36..d4db307 100644
--- a/glucometerutils/drivers/otultra2.py
+++ b/glucometerutils/drivers/otultra2.py
@@ -176,7 +176,18 @@ class Device(object):
 
     return self._parse_datetime(response[2:])
 
+  def zero_log(self):
+    """Zeros out the data log of the device.
+
+    This function will clear the memory of the device deleting all the readings
+    in an irrecoverable way.
+    """
+    response = self._send_oneliner_command('DMZ')
+    if response != 'Z':
+      raise exceptions.InvalidResponse(response)
+
   def _parse_glucose_unit(self, unit):
+
     """Parses the value of a OneTouch Ultra Glucose unit definition.
 
     Args:
@@ -265,7 +276,6 @@ class Device(object):
       yield common.Reading(date, int(line_data['value']),
                            common.UNIT_MGDL, comment=comment)
 
-
   # The following two hashes are taken directly from LifeScan's documentation
   _MEAL_CODES = {
     'N': '',
-- 
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